Heating-stove.



No. 698,806. Patented Apr; 29, I902.

E. H. CAHOONE.

HEATING STOVE. {Application fiiediuly 11, 1901. (No Model.) 4 Sheets-Sheet l.

Sunni Wot No. 698,806; 'Paten'tedA n 29, M2. E. B. CAVHDONE. HEATING STOVE.

(Application filed ml 11, 1901. Q10 Model.) 4 Sheets, $he.e t 2 rwzntoz Mair/F. Ccej'w ozae' attoinw.

Patented Apr. 29, 1902.

E. R. CAHUONE.

HEATING STOVE.

(Application filed July 11, 1901.)

4 Sheets-Sheat 3.

(No Model.)

- [Mara 7|? M00226 No. 698,806. Patented Apr. 29,1902.

EQ-R. GAHOONE.

- HEATINGSTOVE.

(Application filed July 11, 1901.) (No Model.) 4 Sheets-'Sheet 4.

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U ITE STATES PATENT OFFICE.

EDlVIN R. CAHOONE, OF NEWARK, NEW JERSEY.

HgEATl NG-STOVE.

SPECIFICATION forming part of Letters Patent No. 698,80 5, dated April 29, 1902. Application filed July 11,1901. Serial No. 67.888. (No model.)

act description of the invention, suchas will enable others skilled in the art to which it'appertains to make and use the same, reference being had to the accompanying drawings,- and to the figures of reference marked thereon, which form a part of this specification.

This invention relates to improvements in heating-stoves designed, primarily, for burning bituminous coal. In stoves of this general character it has been customary to't-ake the air from the atmosphere direct to a chamher, where it is heated, and from thischamber tion 15, a plate 16, and'a cover 17. The cover deliver it direct to the fuel; .butthis means of heating air to promote combustion has many disadvantages, for the obvious reason that the air is not sufficiently warm to mix and ignite the gases. Hence a large percentage of the latter is carried off in smoke. It is therefore the purpose and object of my pres-,

ent improvements to provide means for tak-' ing the heated air surrounding the stove into a chamber, where it is heated to a higher degree and from whence it is directedathrough ducts to an'air-heating chamber in to the fire-pot. I

The invention also contemplates improvements in the specific manner of introducing heated air to various parts in the fire-pot.

Many other objects and advantages will become apparent in the descriptionto follow and be particularly pointed out in thefclaims. In the drawings forming a part of this specification, Figure 1 is a perspective view of my improved stove. Fig. 2 is a vertical section of the same. Fig. 3 is a detaitperspective view of the casting forming part ofthe auxiliary air-heating chambers and the ducts. Fig. 4 is a detail vertical section similar to Fig. 2, but taken through an adjoining aux-1 Fig,'5 is a cross-- iliary air-heating chamber. section on the line A A of Fig. 2; ,Fig. 6 is a bottom plan view of the stove-top. Fig. 7 is a View in elevation of a modification, showing parts in section. Fig. Sis a similar view of a still further modification. Fig. 9 is a deproximity ported and provided with three series of airexits 9, l0, and 11. In thelatter fit pendent bars 12, which form the lower part of the firepot. The chamber 6 is preferably madein sections and is located in proximity to the fire, so as to be thoroughly'heated thereby. At the same time the walls of the chamber are not seriously affected by the action of the intense heat-,'thisgbeing by reason of the constant supply of air-being delivered thereto.

The top 5-is composed of a supporting-sec- .15. v (See Fig. 4.) The air thus takenis that :which'surrounds the stove and which always has anatural tendency to ascend, and while .ascending it becomes warm by the time said openings are reached. The air thus introduced to these chambers becomes thoroughly heated therein, whereupon it is delivered to the fuel through tubes 2O under the influence of the draft. The other set of'auxiliary airheating chambers 23 is supplied with air from the perforations 23fgand, after being somewhat heated is delivered through ducts 24, formed adjacent the inside of the casing 2, to the air-heatin g chamber 6. The gases passing to the exit-flue through the space 25 between the magazine 4 and the casing 2 gradually and thoroughly heat the air-before it is delivered to the fuel.

The operation is substantially as follows: Fire being started, the air around the stove is heated, and asit ascends it contacts with the overhanging deflector-like portion 15 of the supporting-ring 15 to the auxiliary air-heating chambers 20, where, by reason of its constant contact with the walls thereof, it is further heated and in this condition is delivered downwardly to the fuel through the tubes 20. Likewise the air delivered through the perforations 23 contacts with the walls of the ed air is drawn direct through the fuel-bed at different angles, under the influence of the draft, through the openings 9, 10, and 11. The openings 11 are of such size as to permit the escapeof air when the pendent bars are in position. The ducts consist of depressed plates fitted to correspond to the contour of the stove-casing, the latter forming one of the walls of said ducts. Moreover, the ducts in the rear are of single formation, while those toward the front are forked, this being'for the purpose of equalizing the heating-surface. YVhile this construction is preferred, it is apparent tubes or ducts ofany wellknown form may be employed, and I desire to reserve this right. the ascending radiant heat, superheating, and then delivering it through the fuel prevents the generation or escape of smoke gases which have been heretofore almost uncontrollable. Experience has demonstrated that soft coal can be burned without smoke or soot for heating purposes only when the gen erated gases are metand mixed by air heated to such degree as will effectually cause the molecules of gas to be agitated to create cer-- tain resistances, and this I bring about by the location and arrangement of the air-introducing means. Experience has also proved that the air which is delivered through the fuel from above while being drawn into the heating-chambers direct from the atmos-' phere is heated by the time the incandescent j--mass is reached to approximately the same temperature as the air delivered from the airheating chamber surrounding the fire-pot.

A damper 35 is employed to simultaneously regulate the admission of air to the tubes and ducts, so that the fire maybe at all times under control.

A' drum 30 may surround the casing, forming a space 31 between the two, so that the air entering the chamber 20 can be heated to a degree of surety, and in connection with this drum the escape-flue 32 is constructed in such manner as to radiate the heat and to' more thoroughly utilize the same for heating purposes.

The exit-flue 32 is connected at 36 by an auxiliary flue 37, which is bent around toward the front and then directed down'and toward the rear, where it passes out through the drum and again joins the exit-flue at 38. Between the points 36 and 38 is adamper 39, so that the draft may be either direct or tortuous. gases are directed through the auxiliary flue that heat therein is maintained fora longer period. Consequently the surrounding air is Gathering, as it were,

It is obvious that While the escaping" heated, and thefull'effect of the heat is obtained.

In the disclosure shown in Fig. 7 the same arrangement of ai r-heating chambers and the internal structure is substantially the same as illustrated in the preceding figures; but in addition thereto I have added a modification of the means for maintaining the escaping gases within the stove for a greater period than usual, thereby utilizing all the heat. In saidfigure, 50 representsa series of fines connecting the space 31 at the top and a chamber 51 below the grate, said chamber communicating with a flue 52, which is connected to the exit-flue 53 by a pipe 54:. In the exit-flue 53 is a damper 55, so that-if it be desired to make the gases pass through the flues 50 before escaping to the atmosphere the exit-flue will be closed. On'the other hand, if it be desired totake the gases-from'the'stove direct said damper will be opened; In using-such ,a construction it is'preferred to utilize a drum having the usual escape-fines 58. However,

the drum maybe dispensed with, and I re- 1 serve this right. In Figs. 8 and 9 I have illustrated a series of fines running up from the bottom of the stove to take in theair and heatit'before being delivered to the auxiliary heaters. However, in all other respects the construction is substantially the same as that hereinbefore described. I

In-Fig. 10 I have shown a single chamber 75 to receive the ascending heated air and have omitted the depending tubes 20, openings 76 being provided for introducing air to the fuel. 7

It is obvious that while I have shown the auxiliary heating-chambers applied to a downdraft-stove they are equally applicable to an updraft structure. Moreover, in the general description andclaims I have used the word chambers to specify the structure; but one chamber under certain circumstances is used advantageously, and I desire to state that where this term is used its meaning implies a single auxiliary chamber. I therefore desire to reserve the right to the use of either a chamber or chambers. 7

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. Adowndraft-stove comprising a casing, a fire-pot, an air-heating chamber or chambers arranged at the'top of the stove to receive the ascending heated air surrounding .said heated air being drawn through the fuel under the influence of the draft.

2. Astove comprisingacasing, a fire-pot, an air-heating chamber in proximity to the firepot, auxiliary air-heating chambers, means connecting the chamber iirproximity to the fire-pot and the auxiliary air-heating chambers, a second set of auxiliary chambers, and tubes depending therefrom toward the bed of the fuel to directcurrents of heated air therethrough.

3. A stove comprising a casing, a fire-pot, an air-heating chamber in proximity to said firepot, auxiliary air-heating chambers, a deflector adapted to deflect the ascending heated air surrounding the stove to said chambers and toward the fuel to direct currents of heated air through the fuel-bed.

4. A stove comprising a casing, a fire-pot, a space being formed between said casing and fire-pot, a flue comm unicating with the aforesaid space, an air-heating chamber in proximity to said fire-pot, auxiliary air-heating chambers, ducts connecting said latter airheating chambers and the air-heating chamber in proximity to the fire-pot, said ducts being located between the casing and thefirepot in the path of the gases escaping to the exit-flue. I

5. A stove comprising a casing, a fire-pot, a flue, an air-heating chamber arranged to deliver currents of heated air to the fuel, two sets of auxiliary air-heating chambers, means for supplying one set of auxiliary air-heating chambers with the ascending heated air which surrounds the stove, tubes depending from said chambers to deliver currents of air through the fuel from .the top, the second set of auxiliary chambers being supplied with air from the top, and ducts connecting said latter auxiliary air-heating chambers with the said air-heating chamberwhich surrounds the fire-pot.

6. A heating-stove comprising a casing, a fire-pot, a flue, a perforated air-heating chamber in proximity to and surrounding the firepot, two sets of auxiliary air-heating chambers in the stove-top, deflectors arranged to deliver air to one set of said chambers, means connected to said chamberfordelivering heated-air currents downwardly through the fuel, the second set of auxiliary chambers being supplied with air from the top, and ducts connecting said latter chambers with the airheating'chamber located in proximity to the fire-pot. I

7. A stove, comprising a casing, a fire-pot, a main flue, air-heating chambers arranged to receive the ascending heat surrounding the stove, a space being formed between the firepot and drum, a drum, an auxiliary flue in said space, said flue being connected at both.

ends with the main exit-flue, and a damper adapted to direct the escaping gases either to the main flue or the auxiliary flue.

8. A downdraft-stove, a drum comprising a casing, a fire-pot, a main exit-flue, air-heating chamber or chambers arranged to receive the ascending heat surrounding the stove, a space being formed between the casing and the drum, an auxiliary flue in said space one end of said fine being positioned to receive the escaping products of combustion and its .opposite end in communication with the main heated air being drawn through the fuel under the influence of the draft.

10. A downdraft-stove comprisingacasing, a fire-pot, air-heating chamber or chambers arranged at the top of the stove to receive the ascending heated air: surrounding the stove, an air-heating chamber in proximity to the fire-pot, means of communication between said chamber or chambers and the airheating chamber surrounding said fire-pot, whereby currents of heated air are delivered to the fuel, said currents of air being drawn through the bed of fuel under the influence of the draft.

11. In a downdrafflstove, the combination with a casin g, afire-pot, an exit-flue, air-heating chamber or chambers arranged at or near the top of the stove to receive the ascending heated air which surrounds the stove, means for deflecting the said heated air to the chambers, and tubes extending from said chamber or chambers for delivering heated air to the fuel, said heated airbeing drawn through the fuel under the influence of the draft.

12. In a downdraft-stove, the combination with a casing, a fire-pot, air-heating chambers arranged to receive the ascending heat surrounding the stove, an air-heating chamber surrounding the fire-potrmeans connecting the chambers which receive the ascending heated air and the chamber which surrounds the fire-pot, whereby the ascending heat is preheated and delivered to the fuel, said air being drawn through the fuel under the influence of the draft, a drum, and an exit flue located between the casing, and drum, whereby the ascending air is heated.

13. In a downdraft-stove, the combination with a casing, a fire-pot, an exit-flue, air-heating chambers adapted to receive the ascending heated air which surrounds the stove, said air being delivered to the fuel through openings in the chambers, and drawn through the fuel-bed under the influence of the draft, a drum,a chan1ber,flues connecting said chamber, and a space between the fire-pot and casing, and means for directing the escaping gases through the said flues and chamber, or direct through the exit-flue.

14. In a stove, the combination with a casing,a fire-pot,an exit-flue,an air-heating chamber having openings surrounding the fire-pot and adapted to deliver air to the fuel, means for deflecting the ascending heated air which surrounds the stove to the air-heating chamber in the fire-pot,means for deliveringheated 'air to the fuel from the top, and a series of tubes for delivering a plurality of air-currents to the fuel intermediate the air-currents delivered from the top and the currents of air delivered from the air-heating chamber in the fire-pot.

15. In a downdraft-stove, the combination with a casing, a fire-pot, an exit-flue, an airheating chamber having openings surrounding the fire-pot, and adapted to deliver air to the fuel, means for deflecting the ascending heated air which surrounds the stove to the air-heating chamberin the fire-pot, means for delivering heated air to the fuel from the top, and a series of tubes for delivering a plurality of air-currents to the fuel intermediate the air-currents delivered from the top, and the currents of air-delivered from the airheating chamber in the fire-pot, all of said currents of air being drawn through the fuel under the influence of the draft.

16. In a downdraft-stove, the combination with a casing, a fire-pot, an exit-flue, an airheating chamber arranged to deliver currents of heated air to the fuel, two sets of auxiliary air-heating chambers, means for supplying one set of auxiliary air-heatin g chambers with heated air, tubes depending from said chambers to deliver currents of air to the fuel, the second set of auxiliary chambers communicating direct with the atmosphere, ducts connecting said second set of auxiliary chambers with the first-named air-heating chamber, the two sets of currents of air delivered to the fuel from the latter chamber, and from the tubes, being drawn through the fuel under the influence of the draft.

17. In a downdraft-stove the combination with a casing, a fire-pot, an exit-flue, a plurality of air-heating chambers arranged at or near the top of the stove to receive the ascending heated air which surrounds the stove, means arranged adjacent the fire-pot for preheating the air and delivering said air to the fuel and means communicating with said chambers and the means for preheating the air, the heated air being drawn through the fuel under the influence of the draft.

18. In a downdraft-stove, comprising a firepot,an air-heating chamber from which heated air is delivered to the fuel, auxiliary air-heating chambers, means connecting the air-heating chamber and the auxiliary airheating chambers, a second set of auxiliary chambers, having openings through which currents of heated air are directed to the fuel, said latter currents of heated air and the air delivered to the fuel from the first-named air-heating chamber being drawn through the fuel under the influence of the draft.

with a casing a fire-pot, an exit-flue, auxiliary air-heatin g chambers at or near the top of the stove, an air-heating chamber surrounding the fire-pot and having a series of exit-openings to direct currents of air to the fuel, and ducts connecting the auxiliary air-heating chambers and the air-heating chamber which surrounds the fire-pot, said ducts being located to be heated by the heat in the fire-pot, the heated-air currents delivered to the fuel being drawn through the fuel-bed under the influence of the draft.

21. In a downdraft-stove, the combination with a casing, afire-pot, an exit-flue, air-heating chambers arranged to receive the ascending heated air'surrounding the stove, means communicating with the said air heating chambers for delivering heated-air currents to the fuel, and a series of tubes communi-' eating with the atmosphere for delivering a plurality of air-currents to the fuel independent of the heated-air currents delivered from the air-heating chambers, all of said currents of air being drawn through the fuel under the influence of the draft.

22. In a downdraft-stove, the combination with a casing, a fire-pot, a space being formed between the casing and the fire-pot, an exitflue communicating with said space, a drum spaced from the casing, tubes entering the firepot and communicating with the atmosphere, the air entering said tubes being heated by the ascending heated air in the space formed between the drum and the casipg, and the space between the fire-pot, and easing, air-heating chambers arranged to receive the ascending heated air which surrounds the stove means communicating with said air- ,heating chambers for delivering currents of preheated air to the fuel, all of the aforesaid currents of heated air being drawn through the fuel under the influence of the draft.

In testimony whereof I affix my signature in presence of two Witnesses.

EDWIN R. OAHOONE.

Witnesses:

GEo. B. HARRISON, H. O. BAILEY. 

